condition mean min max ZT0-3 4.75716 3.746655 5.767665 ZT4-7 3.5374600000000003 3.5374600000000003 3.5374600000000003 ZT8-11 4.210015 4.210015 4.210015 ZT12-15 0 0 0 ZT16-19 4.494535 4.494535 4.494535 ZT20-23 3.58261 3.58261 3.58261